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→Reference
''about:neterror''
''about:config'' -- urlclassifier.alternate_error_page default string = "blocked" -- for example -- tells nsDocShell::DisplayLoadError to use the "blocked" page instead of the default generic page.
[https://johnath.com/ https://johnath.com/] -- triggers a "Secure Connection Failed" error page.
[http://example.example.com/ http://example.example.com/] -- triggers an "Address Not Found" error page.